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Collecting Information During a Database Hang
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It can sometimes be downright chaotic when things come to a standstill in the database. You might be swamped with phone calls and anxious visitors to your office who are wondering why things are slow. Oftentimes, especially when serious unknown locking issues are holding up database activity,
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CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
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it s tempting just to bounce the database because usually that clears up the problem. Unfortunately, you don t know what caused the problem, so when it happens again, you re still just as ignorant as you were the first time. Bouncing the database also means that you re disconnecting all active users, which may not always be a smart strategy. It s important that you collect some information quickly for two reasons. First, you might be able to prevent the problem next time or have someone in Oracle tech support (or a private firm) diagnose the problem using their specialized tools and expertise in these matters. Second, most likely a quick shutdown and restart of the database will fix the problem for sure (as in the case of some locking situations, for example). But a database bounce is too mighty a weapon to bring to bear on every similar situation. If you diagnose the problem correctly, simple measures may prevent the problem or help you fix it when it does occur. The following sections describe what you need to do to collect information on a slow or hanging database.
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Using the Database Control s Hang Analysis Page
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You can use OEM s Database Control during an instance slowdown to see a color-coded view of all sessions in the database. The Hang Analysis page provides the following information: Instantaneously blocked sessions Sessions in a prolonged wait state Sessions that are hung Figure 20-1 shows the Database Control Hang Analysis page, which you can access from the Performance page. Click the Hang Analysis link under the Additional Monitoring Links section.
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Figure 20-1. The Database Control Hang Analysis page
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Gathering Error Messages
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The first thing you do when you find out the database suddenly slowed down or is hanging is to look in some of the log files where Oracle might have sent a message. Quickly look in the alert log file to see whether there are any Oracle error messages or any other information that could pinpoint any problems. You can check the directory for background dumps for any other trace files with error messages. I summarize these areas in the following discussion.
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Getting a Systemstate Dump
A systemstate dump is simply a trace file that is output to the user dump directory. Oracle (or a qualified expert) can analyze these dumps and tell you what was going on in the database when the hanging situation occurred. For example, if logons are slow, you can do a systemstate dump during this time, and it may reveal that most of the waits are for a particular type of library cache latch. To get a systemstate dump (for level 10), run the following command: SQL> ALTER SESSION SET EVENTS immediate trace name systemstate level 10 ; Session altered. SQL>
Caution
Oracle Corp. strongly warns against customers setting events on their own. You may sometimes end up causing more severe problems when you set events. Please contact Oracle technical support before you set any event. For example, the event 10235 has been known to cause heavy latch contention.
You can send the resulting output to Oracle so it can analyze the output for you. Note that at this stage, you need to open a technical assistance request (TAR) with Oracle technical support through MetaLink (http://metalink.oracle.com). (The hanging database problem gets you a priority level 1 response, so you should hear from an analyst within minutes.) Oracle technical support may ask you for more information, such as a core dump, and ask you to run a debugger or another diagnostic tool and FTP the output to them.
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